The Delta 40 direct connect 2G/3G/4G antenna is tuned primarily to give good performance at the higher frequencies. The swivel knuckle design is ideal for mounting on IoT modems/routers where the antenna can be positioned for best reception.
The antenna is capable of receiving 2G signals where reception/signal strength from base stations is good. If you only need 3G/4G frequencies in a direct connect antenna then the Delta 40 is a great solution without going to the larger Delta 41. The best transmission frequencies are: 824(2G/4G), 896(2G/4G), 1710(4G), 1990(2G/4G) and 2170(3G) MHz.